Territory



(No Model.) 2 Sheets-Sheet 1.

J. E. SHETTLE.

ROTARY ORE ROASTER.

No. 466,882. Patented Jan. 12, 1892.

INVENTOR:

W .ITNESSES:

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UNITED STATES PATENT OFFICE.

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JULIUS E. SHETTLE, OF SALT LAKE CITY, UTAH TERRITORY.

ROTARY ORE-ROASTER.

SPECIFICATION forming part of Letters Patent No. 466,882, dated January12, 1892.

Application filed June 18, 1891- Serial No- 396,712. (No model.)

To aZZ whom it may concern.-

Be it known that I, J ULIUS E. SHETTLE, a' citizen of the United States,residing in the city and county of Salt Lake, in the Territory of Utah,have invented certain Improvements in Rotary Ore-Roasters, of which thefollowin g is a specification.

My invention relates to the class of rotarycylinder roasters for ores,wherein the ore enters at one end, passes through,'and is discharged atthe opposite end, whereat the furnace-gases enter.

The object of my invention is to provide the cylinder with outlets forthe ore at the discharging end and with means for automatically openingand closing the outlets.

The invention will be fully described hereinafter, and its novelfeatures carefully defined in the claim.

In the accompanying drawings, which serve to illustrate my invention,Figure 1 is a side elevation of the roaster, some of the brickwork beingrepresented in section. Fig. 2 is an end View of the ore-receiving endof the rotary cylinder, the view being taken from the plane indicated bythe dotted line 2 52in Fig. 1. Fig. 3 is a vertical transverse sectiontaken in the plane indicated by the dotted line 3 3 in Fig. 1. Fig. 4 isa detached plan view of the automatic opener. Fig. 5 is a face view, ona large scale, of one of the gravitydoors and its rotary latch; and Fig.5 is a side or edge view of the same.

A is what I will call the cylinder, although I prefer to make itslightly tapered or conical, as shown. This cylinder is of metal, linedwith fire-brick or other suitable refractory material. It rests onrollers a a, and is rotated slowly when in use through the medium of aworm-wheel a, a worm a and a pulley a on the worm-shaft. This is thecommon mode of rotating such cylinders.

B is the furnace from which the gases pass into and through the cylinderA, passing thence into the flue or uptake 0 at the ore-receiving end ofthe cylinder. The cylinderA may be of any desired length. Usually itwill be from twenty to forty feet long and have a diameter of from fourto seven feet. As before stated, it will be slightly tapered bypreference, being largest at the furnace end or ore-discharging end. InFig. 1 it is represented as broken away at the middle part to illustratethat it may vary in length.

So far as above described the construction is the same as or similar tothat commonly employed.

The ore is delivered into the cylinder A through an inclined spout b,and when it reaches the discharging end of the furnace it is dischargedby gravity through the discharge-outlets c,(seen in Fig. 3,) whence itfalls into the banking-pit D. The outlets c, of which thenumberand sizemaybe variable, are in the wall of the cylinder near the end Where thefurnace-gases enter, and these outlets will be by preference equallydistributed about the circumference of the cylinder, as best seen inFig. 3. Each outlet 0 will have a hinged cover d arranged exteriorly tothe cylinder and adapted to open by gravity when unlatched or freed.Figs. 5 and 5 represent the cover d and its rotary latch c on acomparatively large scale. The latch c has a boss which turns on a stude and three equallyspaced arms which radiate from said boss. When thelatch e is turned so as to stand as represented in full lines in Fig. 5,one of its arms takes over the cover (1 and holds it closed; but whensaid latch is turned as represented in dotted lines in said figure-thatis, so that neither of the arms overlap the cover d-the said door isthen free to open by gravity when brought. to the under side of thecylinder by the rotation of the latter.

The latch e is actuated automatically by means that I will now describe.

Suppose the cylinder A to be rotating in the direction of the arrow 2 inFig. 3. Then an outlet 0 reaches apoint directly under the axis of thecylinder, (the cover cl being meanwhile held closed by the latch 6,) thelatch e is rotated through about one-sixth of a revolution by thecontact of one of its arms with an unlocking-bar g. (Seen detached inFig. 4.) This movement of the latch frees the cover d,'which falls andallows some portion of the ore to pass out and down into the pit D. Fig.3 shows the open door just after it has passed the latch-bar. As thecylinder continues to rotate the door (Z graduall closes again, and whenit is about on a level with the axis of the cylinder it will have againclosed. At this point (at 00 in Fig. 3) an arm on the latch encountersahooked locking-bar 7b, which acts to rotate the latch through aboutone-sixth of a revolution or sufficient to again cause an arm of thelatch to take over the cover d and hold it against dropping open. Thebars g and h are stationary and act by detaining an arm of the latch,whereby the rotation of the cylinder effects a partial rotation of thelatch about its stud. These bars 9 and h may be fixed in position; butIpreter to pivot the unlocking-bar g on a cross-frame 2 or on some otherfixed part, so that its operative end may be turned out of the-path ofthe latch, in which case the covers will not be released and the oreWill not be discharged for the time.

By this mechanism I provide for the automatic discharge of the ore in acontinuous manner, thus avoiding the overheating of the ore collected atthe hottest part of the cylinder. With a cylinder provided with mycontinuous automatic discharge the heating of the ore is substantiallyuniform. Thus I avoid the loss of metal by Volatilization and throughthe'carrying off of the dust with the 25 draft.

Having thus described my invention, I claim- In a rotary ore-roaster,the combination,

with the rotatively-mounted cylinder A, pro- 0 vided with a series ofdischarging-outlets for the ore, with pivoted covers cl for saidoutlets, adapted to open by gravity, and with rotary latches e forholding said covers closed, of the unlocking-bar g and locking-bar h,adapted 3 5

